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Milling and drying apparatus incorprorating a cyclone

a drying apparatus and cyclone technology, applied in drying machines, fluidised-bed furnaces, furnaces, etc., can solve the problems of limiting the range of products which can be processed, limiting the quality of the output product, and general failure of prior art designs to provide fine control of processing conditions

Inactive Publication Date: 2004-03-04
RICH TECH SOLUTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0003] It is an object of the present invention to provide apparatus which incorporates a cyclone and which is capable of continuously milling and / or drying a large range of different products with fine control over the particle size / moisture content of the output product.

Problems solved by technology

However, the prior art designs in general fail to provide fine control of processing conditions within the cyclone.
This in turn limits the range of products which can be processed, and also limits the quality of the output product.
Further, most if not all of the known comminuting / dehydrating cyclones operate only batch processes.

Method used

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  • Milling and drying apparatus incorprorating a cyclone
  • Milling and drying apparatus incorprorating a cyclone
  • Milling and drying apparatus incorprorating a cyclone

Examples

Experimental program
Comparison scheme
Effect test

example 2

Seaweed (Macrocystis sp.)

[0109] Initial moisture content--86 percent.

[0110] Final moisture content--8.2%.

[0111] Feed rate into cyclone--5.83 kg per minute.

[0112] Processed product recovered from cyclone--0.816 kg per minute.

[0113] Water evaporated--5.01 kg per minute.

[0114] Temperature of air supplied to duct 10 and device 13--85.degree. Centigrade.

[0115] Velocity of air supplied to duct 10 and device 13--85m per second.

[0116] Air volume supplied to duct 10--2.36 cubic metres per second.

example 3

Sawdust

[0117] initial moisture content--55 percent

[0118] final moisture content--16 percent

[0119] feed rate into cyclone--7.3 kg per minute

[0120] processed product recovered from cyclone--3.79 kg per minute

[0121] water evaporated--3.5 kg per minute

[0122] temperature of air supplied to duct 10 and device 13--70.degree. Centigrade

[0123] Velocity of air supplied to duct 10 and device 13--95m per second

[0124] air volume supplied to duct 10--2.36 cubic metres per second.

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PUM

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Abstract

A cyclone which includes an upper cylindrical portion opening into the wider end of a lower frustro-conical portion, with a primary air inlet such that the inlet air is substantially tangential to the circumference of the cyclone, and an exhaust outlet at or adjacent the top of the cylindrical portion; a control valve is associated with the exhaust outlet and can be used to partially or completely shut off the outlet; a secondary air inlet is associated with the narrow end of the frustro-conical portion and is provided with an air flow stabilising device adapted to admit a stream of air substantially along the longitudinal axis of the cyclone; also including means for withdrawing processed product from the frustro-conical portion.

Description

[0001] The present invention relates to milling and drying apparatus which incorporates a cyclone, and to methods of operation of such apparatus.[0002] The use of a cyclone to separate, mill, or dry material is known, and various applications of cyclones have been described in a number of prior art specifications. For example, U.S. Pat. No. 5,236,132 (Rowley) discloses a comminutor / dehydrator which incorporates a cyclone, as does U.S. Pat. No. 4,390,131 (Pickrel). U.S. Pat. No. 4,743,364 and No. 6,206,202 both disclose classifying / separating apparatus incorporating a cyclone. However, the prior art designs in general fail to provide fine control of processing conditions within the cyclone. This in turn limits the range of products which can be processed, and also limits the quality of the output product. Further, most if not all of the known comminuting / dehydrating cyclones operate only batch processes.OBJECT OF THE INVENTION[0003] It is an object of the present invention to provide...

Claims

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Application Information

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IPC IPC(8): B04C5/18B04C5/14B04C5/181B04C5/20B04C5/26B04C9/00B04C11/00
CPCB02C19/06B04C5/14B04C11/00B04C5/20B04C5/26B04C5/181
Inventor COLES, GRAEME DOUGLASRAFFERTY, ANDREW JAMESRAFFERTY, KAREN MILLICENT
Owner RICH TECH SOLUTIONS